I think they are stepping up Houck's high leverage appearances, and he hasn't gone more than 2 IP or 30 pitches in his last 4 games.
Strahm can't close every game, unless we spread out our save opportunities. My guess is Houck will get a chance to close, very soon. If he does well, he'll get more and more opportunities.
It looks like Strahm, Schreiber and Houck are reaching or at "reliable" levels, which is something this pen has needed for a while. There were stretches we had none of just one.